Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/65182
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dc.contributor.author | Eger, P. | - |
dc.contributor.author | Rowell, G. | - |
dc.contributor.author | Kawamura, A. | - |
dc.contributor.author | Fukui, Y. | - |
dc.contributor.author | Rolland, L. | - |
dc.contributor.author | Stegmann, C. | - |
dc.date.issued | 2011 | - |
dc.identifier.citation | Astronomy and Astrophysics: a European journal, 2011; 526(10):1-9 | - |
dc.identifier.issn | 0004-6361 | - |
dc.identifier.issn | 1432-0746 | - |
dc.identifier.uri | http://hdl.handle.net/2440/65182 | - |
dc.description.abstract | Aims. To explore the nature of the unidentified very-high-energy (VHE, E > 100 GeV) gamma-ray source HESS J1626−490, we investigated the region in X-ray, sub-millimeter, and infrared energy bands. Methods. So far only detected with the HESS array of imaging atmospheric Cherenkov telescopes, HESS J1626−490 could not be unambiguously identified with any source seen at lower energies. Therefore, we analyzed data from an archival XMM-Newton observation, pointed towards HESS J1626−490, to classify detected X-ray point sources according to their spectral properties and their near-infrared counterparts from the 2MASS catalog. Furthermore, we characterized in detail the diffuse X-ray emission from a region compatible with the extended VHE signal. To characterize the interstellar medium surrounding HESS J1626−490 we analyzed 12CO(J = 1−0) molecular line data from the Nanten Galactic plane survey, H i data from the Southern Galactic Plane Survey (SGPS) and Spitzer data from the GLIMPSE and MIPSGAL surveys. Results. None of the detected X-ray point sources fulfills the energy requirements to be considered as the synchrotron radiation counterpart to the VHE source assuming an inverse-Compton (IC) emission scenario. We did not detect any diffuse X-ray excess emission originating in the region around HESS J1626−490 above the Galactic background and the derived upper limit for the total X-ray flux disfavors a purely leptonic emission scenario for HESS J1626−490. We found a good morphological match between molecular and atomic gas in the −27 km s-1 to −18 km s-1 line-of-sight velocity range and HESS J1626−490. The cloud has a mass of 1.8 × 104 M⊙ and is located at a mean kinematic distance of d = 1.8 kpc. Furthermore, we found a density depression in the H i gas at a similar distance, which is spatially consistent with the SNR G335.2+00.1. We discuss various scenarios for the VHE emission, including the CO molecular cloud being a passive target for cosmic ray protons accelerated by the nearby SNR G335.2+00.1. | - |
dc.description.statementofresponsibility | P. Eger, G. Rowell, A. Kawamura, Y. Fukui, L. Rolland, and C. Stegmann | - |
dc.language.iso | en | - |
dc.publisher | E D P Sciences | - |
dc.rights | © ESO, 2010 | - |
dc.source.uri | http://dx.doi.org/10.1051/0004-6361/201015727 | - |
dc.subject | acceleration of particles | - |
dc.subject | ISM: supernova remnants | - |
dc.subject | ISM: clouds | - |
dc.subject | ISM: individual objects: HESS J1626-490 | - |
dc.subject | X-rays: ISM | - |
dc.subject | submillimeter: ISM | - |
dc.title | A multi-wavelength study of the unidentified TeV gamma-ray source HESS J1626-490 | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1051/0004-6361/201015727 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Rowell, G. [0000-0002-9516-1581] | - |
Appears in Collections: | Aurora harvest Chemistry and Physics publications IPAS publications |
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File | Description | Size | Format | |
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hdl_65182.pdf | Published version | 2.24 MB | Adobe PDF | View/Open |
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